Pressure-regulating device for roller-mills.



D. R. BOWEN. PRESSURE RBGULATING DEVICE FOR ROLLER MILLS.

2 SHEETS-8111111131.

Patented Nov. 1, 1910.

nummmr W APPLICATION FILED MAR. 23,1910.

1). R. BOWEN.

Patented NOV. 1, 1910.

2 BHBETB'BHEBT 2.

I IIIIII II lll I I IIIIIIIIIIIIIIIYZFI] UNITED, STATES PATENT OFFICE.

DAVID R. BOWEN, OF ANSONIA, CONNECTICUT, ASSIGNOB T FARR-EL FOUNDRY AND MACHINE COMPANY, OF ANSONIA, CONNECTICUT, A CORPORATION OF CON- NECTICUT. I

. PRESSURE-BEGULATING DEVICE FOR BOLLEBr-MILLS- Specification of Letters Patent.

Patented Nov. 1, 1910.

Application filed March 28, 191 0 Serial No. 551,203.

' citizen of the United States, residing at Anthe cylinder being connected with a suitable sonia, county of New Haven, and State of Connecticut, have invented certain new and useful Improvements in Pressure-Regulating Devices for. Roller-Mills, fully described and. represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in pressure regulating devices for roller mills. i

In roller mills, and particularly such mills as are used for crushlng cane, and similar substances, it is important that the rolls maintain the same pressure on the material passing between them irrespective of variations in the amount of the material. In such mills, therefore, it is customary to employ pressure re lating devices for the rolls, which inclu e a hydraulic cylinder and ram,

hydraulic regulator, and the ram being arranged to bear on theroll bearing. A packing is, of course, necessary, in such constructions, between the ram and the interior of the hydraulic cylinder, to form a tight joint between the two. Experience has shown, however, that packing is unreliable, for the reason that its life is uncertain and varies cylinder. pressures which mills such as those referred the supports or housings in which the bearings for the rolls are located. Each of these caps isbored or chambered and a ram is located in thebore, so that the wall of the bore in the cap forms the hydraulic c linder for the ram, the ram thus working irectly .in -a hydraulic cylinder integral with the cap. This bore or chamber is closed by a removable cover or plate secured by bolts to the top of the cap, this plate being perforated to provide for connections from the hydraulic regulator to the interior of the It. will be understood that the to develop are ve heavy-4n some instances, five hundre d tons-and it is appare ent that the cap and regulating construction must be exceedingly massive in order to withstand such ressures. In the construction which has een referred to, the cover plate for the openin in the cap which forms the hydraulic cylin er is secured in place by heavy bolts or screw studs, and, in order to withstand the forces developed, a considerable number of these studs is necessarily employed,.with the result that, when it becomes necessary to chan e the packing for the ram, all these bolts must be unscrewed to remove the ram for repacking. The 0 eration of thus removing, re acking, an replacing the ram is necessa therefore, one which consumes considerable time, during which time, of course, the mill must be stopped. In the best type of mills now employed, it may require a couple of hours time to effect these 0 erations, and on account of the unreliability of the packing, this may be required to'be done two or three times in a day. The resulting loss of time for operating the mill is serious, especially in view of the fact that cane crushin mills, to which reference is more articular y had, can only run for a limite season and loss of. time'during that season is irreparable.

The present invention has for its object to produce an improved pressure re lating device for roller mills of such a c aracter that the operation of replacing defective packing may be expeditiously performed, thereby decreasing the loss of time incident to suchoperations.

With this and other objects not specifically referred to in view, the invention consists in certain constructions and in certain parts, improvements and combinations as will be hereinafter referred to and specifically ointed out.

Re erring to the accompanying drawings: Figure 1 illustrates in end elevation so much of a three roll roller mill as is necessary to an understanding of the invention. Fig. 2 is a plan view of the construction shown in Fig. 1, the hydraulic regulator indicated in Fig. 1 being, however, omitted from this view. Fig. 3 is a sectional elevation, on an enlarged scale, of the pressure regulator construction shown in Fig. 1. Figs. 4 and ,5 are sectional plan views, respectively, of the construction shown in Fig. 8, the planes of the sections being indicated by the lines 44 and 55, respectively, in said figure. Fig. 6 is a detail sectional view illustrating the interior construction of the bore of the cap shown in the preceding figures, showing the locking devices which may be employed. Fig. 7 is an exterior view of the cylinder shown in the preceding figures.

Referring to'the accompanying drawings which illustrate one embodiment of the invention, 1 indicates the side frames on which the mill construction is mounted, the housings in which the roll bearings are mounted being indicated at "The mill illustrated employs three rolls the journals of which are marked 4, 5 and 6, these rolls being in tergeared, as usual in mill constructions. The bearings for the lower rolls are held in position by caps 7, 8, and the bearings for the upper roll are held in position by caps 9.

Constructions embodying the invention will include pressure regulating devices by which the pressure developed by the rolls is substantially uniform notwithstanding variations in the amount of mate ial passing between the rolls. These pressure regulating devices may cooperate with one or more of the rolls, as desired, but in the-particular construction illustrated, the devices cooperate with the upper roll. 7

As illustrated, the caps 9. are held in position on the housings by long ,bolts 10 which extend through the housings and through plates 11 located in recesses 12 in the frame 1, the lower ends of the bolts being provided with slots through which pass keys 13,v as usual in such constructions. These bolts, as, shown, are'provided With heavy nuts 14 which when turned down lock the caps securely to the housings.

In constructions embodyin r the invention, each cap will be. provided with an interior chamber or bore arranged to receive a cylinder which forms a part of the pressure regulatin g construction, the cylinder being removably located and firmly held in position in the bore or chamber of the cap. In the particular construction illustrated, the bore or chamber referred to is marked 15 and the cylinder is marked 16. \Vhile the construction by which the cylinder is locked in posi tion in the bore of the cap may be varied, in the particular construction shown, the bore is provided with two locking projections 17 which may be formed integrally with the cap by the boring operations in a manner which will be readily understood. It is, of course, apparent that the locking devices employed should be extremely strong in order to withstand the pressures developed in the operation of the mill, and when they are tween the projections 17 in the bore.

formed in the manner described the variation in the bores should be such as to provide strong heavy shoulders, the shoulders re-' ferred to being marked 18. The cylinder, in the bore construction illustrated, is provided with corresponding projections 19, these projections having shoulders 20, the projections being less in width than the spaces be- The cylinder may be provided with any suitable means for manipulating it, such, for instance, as eye bolts 21, fast in its head (see Figs. 1 and 2). With this construction it is apparent that the cylinder may, by means of a crane, or other suitable handling device, be dropped into the bore of the cap, the projections 19 passing between the projections 17 on the bore. The position which the lugs 19 occupy when the cylinder is being placed in position is indicated by dotted lines in Fig. 5. hen the cylinder has been dropped into the bore it will be given a quarter turn so as to bring the shoulders 20 of the projections 19 underneath the shoulders 18 of the projections 17. Means may be provided for bringing the shoulders 20 firmly and snugly, against the shoulders 18. While these means may be varied in character, as shown, the head of the cylinder 16 is provided with a threaded boss 22 engaged by a nut 23 sufiiciently large to overlie the edge of the cap around the bore. This nut .may be provided with openings, as 24, into which a bar may be inserted for the purpose of turning the nut. The cylinder is provided ceive a ram, as 26, this ram, in the construction shown, bearing on a block 27 which in turn bears on the box 28 of the roll journal 5. The ram will be packed in the recess 25 of the cylinder by any suitable packing, such a packing being indicated at 29. This form of packing being well-known, a specific description of it is unnecessary. The

.cylinder will further be perforated, as at 30,

to admit the fluid employed for operating the ram into the chamber 25,. the pipe for admitting the fluid being indicated at 31 and being held in and bolts 33.

If desired, means maybe provided for holding the cylinder in such position that its locking devices will properly and truly engage with the locking devices in the cap, and these means may be of such character as to indicate when the cylinder is properly positioned in order to prevent the mill from being started before the locking engagement between the cylinder and the cap is established. In the construction shown, there are provided stop pins 34:,35, these pins being threaded through bosses 36 extending into the bore or chamber of the position by a suitable collar 32 with the usual recess or chamber 25 to reon the cap and cap below and in line with the adjacent edges of the projections 17. \Vhen the cylinder is to be removed, one of these stop pins, say, the pin 35, is unscrewed, which will permit the cylinder to be turned toward the left, as shown in Fig. 4, the movement being continued until one of the shoulders strikes the other pin, 34, at which time the cylinder will be in position to be drawn out of the bore in the cap. When the cylinder is replaced, it is apparent that the stop pin cannot be screwed in until the cylinder has been properly positioned in the bore. So long as this pin is not screwed in, therefore, the operator is informed that the cylinder is not in its proper position in the bore of the cap.

The pipe 31 will be arranged to connect with a suitable pressure regulator, 36. The

. detailsbf such re ilators, ordinarily known down, another cylinder an carried into effect.

as hydraulic regu ators, are well-known and a specific illustration and description of th one indicated is unnecessary.

It will beunderstood that a pressure regulating device of the character referred to will employed at each end of the roll or rolls to which it is applied, and that the piping will be so arranged that the regulator will connect with both cylinders.

It is apparent that with this construction a ram may be repacked very quickly. When this operation is necessary, the nut 23 is loosened slightly and one of the pins 34, 35 unscrewed. The cylinder may then be lifted by a crane, or other lifting device, out of the cap and. the repacking proceeded with, after which the cylinder may be readily replaced. The two operations referred to require, of course, but very little time, so that the replacing of the packing can be very quickly performed. Further, if desired, spare cylinders and rams, the packings of which have been thoroughly tested out, may be kept in the storehouse, and herr a acking breaks ram may be substituted for the ones rendered useless by the failure of the packing which will still further lessen the time during which the mill must be stopped to replace a packing.

Changes and variations may be made in the construction by which the invention is The invention is not, therefore, to be confined to the particular construction herein described and illustrated in the accompanying drawings.

What is claimed is 1. A pressure regulating device for roller mills including in combination an interiorly bored cap for the roll support, a cylinder removably located in the bore of the cap, a

ram in the cylinder operating on the roll bored cap for the roll support,a cylinder located in the bore of the cap, locking means mills including in combination an,interiorlybored cap for the roll support, a cylinder located in the bore of the cap, locking projections in saidbore, locking projections on the cylinder which engage with the rojection in the bore, and a ram in the cylin or for operating on the roll bearing.

4. A pressure regulating device for roller mills including in combination an interiorly bored cap for the support, locking projections in the bore, said rojections being spaced apart circumferentially,acylinderlocated in the bore of the cap, lockingprojections on the cylinder less in width than the space between the projections in the bore and arranged to cooperate with said projections, and a ram in the cylinder for operating on the roll bearing.

5. A pressure regulating device for roller mills including in combination an interiorly bored cap, bolts for securing the cap to the roll support, locking projections in the bore, a cylinder located in the bore, locking projections on the cylinder which may be caused to engage with the projections in the bore, means for bringing the projections on the cylinder snugly against the rojections in the bore, and a ram in the cy inder operating on the roll bearing.

6. A pressure regulating device for roller mills including in combination an interiorly bored cap for the roll su port, locking projections 1n the bore, sai projections being spaced apart circumferentially, a cylinder in the bore having locking projections less in width than the spaces between the projections in the bore, a threaded boss on the cylinder, a nut on the boss, said niit overlying the cap whereby the locking projections in the bore and on the cylinder may be brought snugly together, a ram in the cylinder-for operating on the roll bearin i 7. A pressure regulating evice for roller mills including in combination an interiorly bored cap for the roll support, locking.

means carried by the cap, a cylinder located in the bore of the cap, locking means on the' 8. A pressure regulating device for roller mills including in combination an interiorly bored cap for the roll support, lockmg projections 1n the bore of the cap, said projections being s aced apart circumferentially, a cylinder in t e bore of the ca locking projections 'on the cylinder less 1n width than the spaces between the projections in the my hand, in the presence of two subscribing bore and arranged to cooperate with said witnesses. projections, means for determining When said projections are properly engaged, and 5 a ram in the cylinder operating on the roll Witnesses:

bearing. CHARLES F. Buss,

In testimony whereof, I have hereunto set LAWRENCE K. BLACKMAN.

DAVID R. BOWEN. 

